. this square erupted with cheers as the pope moved through the crowd. this city of history witnessed something it hasn't seen since 600 years, a pope leaving the papacy. to love the church means to have the courage to make painful, difficult decisions the pope said. i would like to thank everyone for understanding. ♪ 50,000 faithful were invited, thousands more came to celebrate a pope, arriving in his pope mobile. many young people. pope benedict xvi, the first pope they've known and the old who know how his story is. gathering to hear the last testament. and looking on the cardinal, one of these men could soon be pope, the first from pope benedict, a prayer. a final message to his follower followers. >> ask each of you to pray for me and for the new pope i impart my blessing. thank you. [ applause ] >> reporter: this frail man choosing a quieter life. so very different from his predecessor john paul who stayed until the very end. anthony from pennsylvania witnessed both pope's last sermons. >> they're courage in different ways. in opposite ways but the same degree of courage. >> reporter: